Added more @Scalars after a gv checks and #p5p discussion

 Added $^CHILD_ERROR_NATIVE $^GLOBAL_PHASE $^LAST_FH $^MATCH $^PREMATCH
 $^POSTMATCH $^UTF8CACHE $^WIN32_SLOPPY_STAT.
 $^WIN32_SLOPPY_STAT is hidden as "\027IN32_SLOPPY_STAT"